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Attachments:
ASIMOV:
You can also do it by inclusion exclusion principle
Which is a set theory concept
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Sn = 102 + 108 + 114 + 120..........+ 396
a=102, d=6, l =396,
n=?, Sn=?
a+(n-1)d= l
102 + (n-1)6 =396
102+6n-6=396
6n+96 =396
6n=396 - 96
6n=300
n=300/6
n=50
No. of terms=50
Sn=n(a+l)/2
= 50 (102+396)/2
= 25×498
= 12450
Hope it helps
a=102, d=6, l =396,
n=?, Sn=?
a+(n-1)d= l
102 + (n-1)6 =396
102+6n-6=396
6n+96 =396
6n=396 - 96
6n=300
n=300/6
n=50
No. of terms=50
Sn=n(a+l)/2
= 50 (102+396)/2
= 25×498
= 12450
Hope it helps
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